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UDC 628.166.094.3

Grabovskii P. A., Gorobchenko A. I.

Adaptive control method in water disinfection

Summary

Pathogenic microorganisms present in natural water sources can be partially removed in the process of physical and chemical treatment (coagulation, contact clarification, filtration with presedimentation or flotation and other methods). Their final inactivation can be provided by oxidation with chlorine, chlorine dioxide, sodium hypochlorite and chloramines, ozone, as well as by UV-irradiation. The problems arising during chemical water disinfection are considered. The actuality of the problems is related to the decrease in water consumption, in big cities in particular. Owing to this the time of water retention in the distribution network increases, and in the far points the concentration of disinfectants in water is unacceptably low. The complexity of determining the chemical dosages conditioned by continuous fluctuations in the water consumption and water quality is shown. The operation of a network with the use of EPANET 2.0 software was simulated. The disinfectant concentration changes in water along the network length for «short» and «long» sections were studied. The dosing patterns for a network with two disinfectant injection points were developed. The practicability of adaptive control of the disinfection process is shown and its algorithm has been developed. The introduction of the proposed control scheme will provide for not only economic benefit by reducing chemical consumption but also for improving the reliability of water disinfection, improving the quality of the disinfected water, developing the data base for optimization and predictions, improving the customer service level.

Key words

mobile laboratory , disinfection , optimization , water treatment , adaptive control , algorythm